Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean

Natural iron fertilization processes are occurring around the Crozet Islands (46°26?S–52°18?E), thus relieving the water masses from the normally encountered High Nutrients Low Chlorophyll (HNLC) conditions of the Southern Ocean. During austral summers 2004/2005 and 2005/2006, iron and aluminium con...

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Published in:Marine Chemistry
Main Authors: Planquette, Hélène, Fones, Gary R., Statham, Peter J., Morris, Paul J.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2009
Subjects:
Austral
Southern Ocean
Crozet Islands
Online Access:https://eprints.soton.ac.uk/68673/
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author Planquette, Hélène
Fones, Gary R.
Statham, Peter J.
Morris, Paul J.
author_facet Planquette, Hélène
Fones, Gary R.
Statham, Peter J.
Morris, Paul J.
author_sort Planquette, Hélène
collection University of Southampton: e-Prints Soton
container_issue 1-2
container_start_page 31
container_title Marine Chemistry
container_volume 115
description Natural iron fertilization processes are occurring around the Crozet Islands (46°26?S–52°18?E), thus relieving the water masses from the normally encountered High Nutrients Low Chlorophyll (HNLC) conditions of the Southern Ocean. During austral summers 2004/2005 and 2005/2006, iron and aluminium concentrations were investigated in large particles (> 53 µm) collected from just below the mixed layer at stations under the influence of island inputs, and also in adjacent HNLC waters. These large particles are anticipated to sink out of the mixed layer, and to reflect the net effects of input and cycling of these elements in the overlying mixed layer. Labile and refractory fractions were determined by a two-stage leaching technique. Data showed that water masses downstream of the islands were enriched in total iron and aluminium (0.25–2.68 nmol L? 1 and 0.34–3.28 nmol L? 1 respectively), relative to the southern HNLC control sites (0.15–0.29 nmol L? 1 for Fe and 0.12–0.29 nmol L? 1 for Al), with only a small fraction (typically < 1%) being acid leachable in both environments. Particulate iron predominantly derived from the island system represents a significant fraction of the total water column iron inventory and may complement dissolved Fe inputs that help support the high summer productivity around the Crozet islands.
format Article in Journal/Newspaper
genre Crozet Islands
Southern Ocean
genre_facet Crozet Islands
Southern Ocean
geographic Austral
Southern Ocean
geographic_facet Austral
Southern Ocean
id ftsouthampton:oai:eprints.soton.ac.uk:68673
institution Open Polar
language unknown
op_collection_id ftsouthampton
op_container_end_page 42
op_doi https://doi.org/10.1016/j.marchem.2009.06.002
op_relation Planquette, Hélène, Fones, Gary R., Statham, Peter J. and Morris, Paul J. (2009) Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean. Marine Chemistry, 115 (1-2), 31-42. (doi:10.1016/j.marchem.2009.06.002 <http://dx.doi.org/10.1016/j.marchem.2009.06.002>).
publishDate 2009
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spelling ftsouthampton:oai:eprints.soton.ac.uk:68673 2025-04-06T14:50:45+00:00 Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean Planquette, Hélène Fones, Gary R. Statham, Peter J. Morris, Paul J. 2009-06-20 https://eprints.soton.ac.uk/68673/ unknown Planquette, Hélène, Fones, Gary R., Statham, Peter J. and Morris, Paul J. (2009) Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean. Marine Chemistry, 115 (1-2), 31-42. (doi:10.1016/j.marchem.2009.06.002 <http://dx.doi.org/10.1016/j.marchem.2009.06.002>). Article PeerReviewed 2009 ftsouthampton https://doi.org/10.1016/j.marchem.2009.06.002 2025-03-11T10:12:35Z Natural iron fertilization processes are occurring around the Crozet Islands (46°26?S–52°18?E), thus relieving the water masses from the normally encountered High Nutrients Low Chlorophyll (HNLC) conditions of the Southern Ocean. During austral summers 2004/2005 and 2005/2006, iron and aluminium concentrations were investigated in large particles (> 53 µm) collected from just below the mixed layer at stations under the influence of island inputs, and also in adjacent HNLC waters. These large particles are anticipated to sink out of the mixed layer, and to reflect the net effects of input and cycling of these elements in the overlying mixed layer. Labile and refractory fractions were determined by a two-stage leaching technique. Data showed that water masses downstream of the islands were enriched in total iron and aluminium (0.25–2.68 nmol L? 1 and 0.34–3.28 nmol L? 1 respectively), relative to the southern HNLC control sites (0.15–0.29 nmol L? 1 for Fe and 0.12–0.29 nmol L? 1 for Al), with only a small fraction (typically < 1%) being acid leachable in both environments. Particulate iron predominantly derived from the island system represents a significant fraction of the total water column iron inventory and may complement dissolved Fe inputs that help support the high summer productivity around the Crozet islands. Article in Journal/Newspaper Crozet Islands Southern Ocean University of Southampton: e-Prints Soton Austral Southern Ocean Marine Chemistry 115 1-2 31 42
spellingShingle Planquette, Hélène
Fones, Gary R.
Statham, Peter J.
Morris, Paul J.
Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title_full Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title_fullStr Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title_full_unstemmed Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title_short Origin of iron and aluminium in large particles (> 53 µm) in the Crozet region, Southern Ocean
title_sort origin of iron and aluminium in large particles (> 53 µm) in the crozet region, southern ocean
url https://eprints.soton.ac.uk/68673/

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